Sprayer.



F. S. WELCH.

SPRAYER.

APPLICATION FILED oc zu, 1912.

WITNESSES INVENTOR ATTORNEY Patented July 20, 1915.

FRED S. WELGH, OF PONTIAC, MICHIGAN.

SPRAYER.

Specification of Letters Patent.

Patented July 20, 1915.

Application filed October 31, 1912.. Serial No. 728,789.

To all whom it may concern Be it known that I, FRED S. WEpoH, a citizen of the United States, residing at Pontiac, county of Oakland, State of Michigan, have invented a certain new and useful Improvement in Sprayers, and declare the following to be a full, clear, and exact description of the same, such as will enable object of my improvements is to provide an efiicient regulator in which the pressure shall be maintained without wasting the power. I secure this object in the device illustrated in the accompanylng drawmg, 1n

4 which the figure is an elevation, mostly in section, of an apparatus embodying my invention.

i a, is a supply reservoir containing the liquid which is to be sprayed.

g is a chamber inclosmg an air cushion into which theliquid from the reservoir a is forced and from which it s supplied through a pipe 7;, under the pressure of the air above the-liquid therein, thus forming an equalizing chamber.

z, is a gage to indi air in the chamber 9;

b, is a cylinder 0, is a supply pipe leading from the reservoir a to the lower end of the cylrnder I).

d, is a check valve in the supply p pe 0. V e, is a pipe through which the llquid 1s gonveyed from the cylinder 6 to the chamf is a check valve in. Pipe 6. y, is a piston fitting and adapted to reciprocate in the cylinder 1).

cate the pressure of 7c, is a connecting rod and m, a crank for' reciprocating the piston j.

n, is a passage leading downward from the lower end of the cylinder 6 above the reservoir a.

o, is a cylindrical projection from the lower end of the cylinder 1) havlng the passage n axially through it.

12, is a cap fitting and adapted to slide s, is a valve upon the upper end of a projection u, rising from the lower end of the cap p. Said projection forms a piston adapted to fit loosely and reciprocate in said opening.

t, is a cylindrical opening in the lower end of the projection 0 concentric therewith and with the passage n. The cylindrical opening t is of much larger diameter than the passage n or the valve seat surrounding the lower end of said passage. The-projection a fits loosely intheopening 25.

'v, 'v, are rods depending from the cover of the reservoir (1.

w, is a cross piece supported by the rods- 4), '2), at the lower ends thereof.

w, is a spring, the lower end of which rests in a seat on the cross piece a: and the upper end in a seat on the lower surface of the cap 10. The spring '00 acts to force the cap p upward and the valve against the valve seat 1', to close the opening from the passage n. v I

y, are nuts upon the upper screwthreaded ends of the rods 1), o. By these nuts the rods o, '0, may be adjusted verti-. cally to regulate the tension of the spring w.

The operation of the above described device is as follows :-The piston j is reciprocated by any convenient source of power the chamber 9 has reached the,-- required amount, the pressure of the fluid iii-the cylinder b will force the cap 7) downward, allowing the fluid to escape through the passage n into the opening at, where it will act upon the large surface of the upper end of the projection u, so that with small pressure, the cap 10 will be forced downward beyond the mouth of the opening t, thus relieving the pressure in the cylinder 1). By this arrangement, the cutting of the valve is avoided, inasmuch as the valve 8 is free and at some distance from its seat when the fluid escapes from the cylinderb, and the escaping fluid is not wiredrawn and the fluid escapes from the pump at a low pressure, so that but little work is done by the piston 7' when the relief valve is open. 110

ED STATES PATENT oFFIoE. 1

Q memse It will also be noticed that the Work is taken off from the pump just as long as the pressure is sufficient in the chamber 9, so that the fluid that has already been forced into the chamber 9 is not wasted, as is the case where the relief valve is put directly on said chamber.

The relief valve is located directly above the reservoir 0;, so that the escaping fluid is returned to said reservoir.

What I claim is z 1. In a sprayer; a pump having an intake valve and a discharge Valve, an equalizing chamber located beyond said discharge valve, a passage communicating with said cylinder between said valves, and a valve closing saidpassage adapted to yield to a given pressure in said cylinder, and when it has yielded to be held away from its closed position by a less pressure than that to as which it initially yielded 2. In a sprayer, a cylinder having an intake and a discharge valve, an equalizing chamber located beyond said discharge valve, a passage communicating with said cylinder between said valves, said passage being enlarged at its outer end and having a piston fitting loosely in said enlargement and provided with a valve adapted to close the smaller portion of said passage, and

means for yieldingly holding said valve to its seat.

In testimony whereof, ll sign this specification in the presence of'tWo Witnesses.

FRED S. WELCH. Witnesses: I

VIRGINIA C. SPRATT, ELLIOTT J. SToDDAno. 

